<html lang="">
<head>
    <meta charset="utf-8">
    <title>Go and WebAssembly</title>
</head>
<body>
    <script src="wasm_exec.js"></script>
    <script>
        if (!WebAssembly.instantiateStreaming) { // polyfill
            WebAssembly.instantiateStreaming = async (resp, importObject) => {
                const source = await (await resp).arrayBuffer();
                return await WebAssembly.instantiate(source, importObject);
            };
        }

        const go = new Go();
        let mod, inst;
        WebAssembly.instantiateStreaming(fetch("main.wasm"), go.importObject).then((result) => {
            mod = result.module;
            inst = result.instance;
            document.getElementById("runButton").disabled = false;
        }).catch((err) => {
            console.error(err);
        });

        async function run() {
            console.clear();
            await go.run(inst);
            inst = await WebAssembly.instantiate(mod, go.importObject);
        }
    </script>
    <button onClick="run();" id="runButton" disabled>Run</button> </body>
</html>
